Custom taxonomy

event.php

<?php

function ath_register_event_taxonomies()
{
    $ath_taxonomy = new Ath_Taxonomy();
    $ath_taxonomy->create_hierarchical_taxonomy( "event", "event_category", "Event Categories", "Event Category", "event-category" );
    $ath_taxonomy->create_taxonomy( "event", "event_tag", "Event Tags", "Event Tag", "event-tag" );

}
add_action( 'init', 'ath_register_event_taxonomies' );

taxonomy-class.php

<?php

class Ath_Taxonomy
{
    //Will create category like taxonomy
    function create_hierarchical_taxonomy( $post_type, $taxonomy_key, $name, $singular_name, $slug )
    {
        register_taxonomy(
            $taxonomy_key,
            $post_type,
            array(
                'label' => __( $singular_name ),
                'labels' => array(
                    'name' => _x( $name, 'taxonomy general name' ),
                    'singular_name' => _x( $singular_name, 'taxonomy singular name' ),
                    'search_items' =>  __( 'Search '.$name ),
                    'popular_items' => __( 'Popular '.$name ),
                    'all_items' => __( 'All '.$name ),
                    'parent_item' => null,
                    'parent_item_colon' => null,
                    'edit_item' => __( 'Edit '.$singular_name ),
                    'update_item' => __( 'Update '.$singular_name ),
                    'add_new_item' => __( 'Add New '.$singular_name ),
                    'new_item_name' => __( 'New '.$singular_name.' Name' ),
                    'menu_name' => __( $name ),
                ),
                'public' => true,
                'show_in_nav_menus' => true,
                'show_ui' => true,
                'show_tagcloud' => true,
                'hierarchical' => true,
                'update_count_callback' => '',
                'rewrite' => array(
                    'slug' => $slug,
                    'with_front' => false,
                    'hierarchical' => false,
                ),
                'capabilities' => array('manage_terms', 'edit_terms', 'delete_terms', 'manage_categories', 'assign_terms',),
            )
        );
    }
    //Will create tag like taxonomy
    function create_taxonomy( $post_type, $taxonomy_key, $name, $singular_name, $slug )
    {
        register_taxonomy(
            $taxonomy_key,
            $post_type,
            array(
                'label' => __( $singular_name ),
                'labels' => array(
                    'name' => _x( $name, 'taxonomy general name' ),
                    'singular_name' => _x( $singular_name, 'taxonomy singular name' ),
                    'search_items' =>  __( 'Search '.$name ),
                    'popular_items' => __( 'Popular '.$name ),
                    'all_items' => __( 'All '.$name ),
                    'parent_item' => null,
                    'parent_item_colon' => null,
                    'edit_item' => __( 'Edit '.$singular_name ),
                    'update_item' => __( 'Update '.$singular_name ),
                    'add_new_item' => __( 'Add New '.$singular_name ),
                    'new_item_name' => __( 'New '.$singular_name.' Name' ),
                    'separate_items_with_commas' => __( 'Separate '.$name.' with commas' ),
                    'add_or_remove_items' => __( 'Add or remove '.$name ),
                    'choose_from_most_used' => __( 'Choose from the most used '.$name ),
                    'menu_name' => __( $name ),
                ),
                'public' => true,
                'show_in_nav_menus' => true,
                'show_ui' => true,
                'show_tagcloud' => true,
                'hierarchical' => false,
                'update_count_callback' => '',
                'rewrite' => array(
                    'slug' => $slug,
                    'with_front' => false,
                    'hierarchical' => false,
                ),
                'capabilities' => array('manage_terms', 'edit_terms', 'delete_terms', 'manage_categories', 'assign_terms',),
            )
        );
    }
}


?>